pub fn dp_rec_mc(amount: u32) -> u32 {
    let denominations = [100, 50, 30, 20, 10, 5, 2, 1];
    let mut count = 0;
    let mut remaining = amount;

    for denomination in denominations.iter() {
        count += remaining / *denomination;
        remaining %= *denomination;
    }

    count
}
